Evidence, Memory and the Malleable Photograph

Total Page:16

File Type:pdf, Size:1020Kb

Evidence, Memory and the Malleable Photograph SCENE 5 (1) pp. 37–46 Intellect Limited 2017 Scene Volume 5 Number 1 © 2017 Intellect Ltd Article. English language. doi: 10.1386/scene.5.1.37_1 MICHELLE BOGRE Parsons School of Design Evidence, memory and the malleable photograph ABSTRACT KEYWORDS This article explores the capacity of the photograph to furnish evidence, which photography derives both from its indexicality and from the visual accuracy of the raw image. evidence Photographs achieve the status of evidence not because the photograph itself has memory any implicit identity but rather because the State recognized that the photograph fraud could provide proof of identification – mug shots – as early as 1850 when police activism departments hired photographers to take mug shots and crime scene photographs. revolution Courts accepted the photograph as evidence as early as 1859 and continue today, even employing ‘Instagram’ officers whose job entails monitoring Instagram accounts of persons of interest. The article then explores why the photograph remains believ- able today to the public even with contemporary discourse about the malleability of the photograph. In her seminal text, On Photography, Susan Sontag wrote: ‘[p]hotographs furnish evidence. Something we hear about, but doubt, seems proven when we’re shown a photograph of it’ ([1977] 2001). In the 35 years since Sontag wrote that, critics and scholar have repeatedly questioned whether photo- graphs can ever be evidence or unequivocally stated that they cannot. Despite the volumes written by scholars questioning the veracity and vicissitudes of the photograph, particularly the digital photograph, the viewing public still generally believes that a photograph is true, and as true, proof (evidence) of what happened. Why? 37 04_SCENE_5.1_Bogre_37-46.indd 37 21/08/17 11:41 AM Michelle Bogre A photograph’s capacity to furnish evidence derives both from its ‘indexicality’ and from the visual accuracy of the raw image. Indexicality, a term coined by philosopher Charles Peirce, ‘depends on a physical relationship between the object photographed and the image finally created’ (Gunning 2008: 24). The image on a film negative literally comes from the light reflect- ing off the object in front of the lens and falling onto light-sensitive material. The image on a memory card comes from ‘data about light that is encoded in a matrix of numbers’ (Gunning 2008: 24). In the context of indexicality, little difference exists between the film negative and the digital negative. The relationship between light and proximity to the object forms the basis for the public’s belief in the ‘truth’ of a photograph and its value as evidence. Even when almost all digital images are retouched post production, the public still believes in photographic truth, in part because most post production only alters the original and often only slightly; post production usually does not so completely erase the original images as to negate its indexicality. John Tagg would note that this implicit trust in the photograph derives not from the photograph itself, which has no implicit identity, but from status within the sphere it inhabits. Writing about the photograph he states: ‘[i]ts status as technology varies with the power relations which invest it’ (Tagg 1999). For the photograph as evidence, that value and status exist in the sphere granted by the State. Police departments and law enforcement agen- cies in the United Kingdom and the United States understood the value of the photograph for proof of identification as early as the mid-1800s and indeed police departments hired photographers as early as 1850 to photograph crime scenes and to take mugshots. US courts have been granting the photograph a privileged status as evidence – a guaranteed witness of the actuality of events that it represented – as early as 1859 when an appellate court accepted photographs in a land grant case that hinged on whether a document of title was forged (Luco v. United States 1859). The appellate court accepted the photo- graphs because ‘… as evidence, the photograph admitted no ambiguity’ (Green-Lewis 1996). In 1860, in Marcy v. Barnes, a case involving a disputed Figure 1: Catherine O’Neill, mug shot, facing front and to her left (1906). 38 Scene www.intellectbooks.com 39 04_SCENE_5.1_Bogre_37-46.indd 38 21/08/17 11:41 AM Evidence, memory and the malleable photograph signature on a promissory note, magnified photographic copies of signatures were admitted as evidence along with the testimony of photographer Albert S. Southworth. After the jury found for the plaintiff, the defendant appealed and challenged the admission of photographic evidence. The appellate court accepted the photographic evidence because ‘… we are unable to perceive any valid objection to the use of such prepared representations’ (Marcy v. Barnes 1860). An 1869 case challenging a photograph’s legal status as evidence involved a case of fraud against a Boston, Massachusetts’s photographer William H. Mumler (Cloutier 2004; Kaplan 2008). Mumler, a self-taught photographer, experimented with making self-portraits in which a shadowy, ghost-like apparition appeared. Mumler claimed that he did not know how the ‘ghost’ figures appeared. Even fellow photographers who claimed to have followed him during the photographic sessions and into the darkroom claimed not to know how he was producing these spirit photographs. As the ghosts mate- rialized in his images Mumler garnered accolades and a thriving career. The jig was up when the same ghost – who in reality was a Boston resident very much alive – turned up in two photographs. In 1869 in New York City, Mumler was arrested for fraud and accused of selling photographs under false pretenses. Both Mumler and the photograph as evidence were on trial. During a preliminary hearing before New York City Court of Special Sessions Judge Dowling to assess whether there was sufficient evidence to send the case to a grand jury, the expert photographic witnesses for the pros- ecution testified that photographs could be manipulated in the darkroom. The testimony was complicated because these same witnesses wanted to preserve the authority of the photograph as evidence. They carefully empha- sized the mechanical (and not malleable) process of photography. When explaining how photographs could be manipulated, they pointed out how such manipulation was easily detectable and that manipulation took skill and time, attempting to mitigate damage to the idea that photographs were not true. Just as bad counterfeit money does not discredit genuine money ‘… fake photographs are not alarming unless there is a risk that they might be confused with authentic ones’ (Mnookin 1998: 37). If fakery took time and skill, it was not so much the photograph that was on trial, but the photog- rapher or as activist photographer Lewis Hine stated in 1909: ‘[p]hotographs don’t lie, but liars may photograph’ (1980: 110–13). Witnesses for the defence supported the photograph as evidence, testifying that they believed in spir- its because they had seen Mumler’s photographs: ‘… the pictures themselves furnish evidence in their gauze-like appearance, that has not been imitated’ (Mnookin 1998: 37). After seven days of testimony, the judge reluctantly dropped the case against Mumler because he said that the prosecution had not proven that the photographs were fraudulent and had not introduced any evidence that Mumler was a fraud. Photographs became routine evidentiary tools in the early 1900s and were used to prove, among other things, locations of buildings and terrains in land disputes, accidents and to distinguish corpuscles of human blood from animal blood. Judges grasped the idea of idexicality even as they did not use the term, describing photographs as ‘light printed pictures produced by the operation of natural laws and not by the hand of man’ (Porter v. Buckley [1906] 1928). Oliver Wendell Holmes wrote about photography, ‘[f]orm is henceforth divorced from matter […] Give us a few negatives of a thing worth seeing, taken from different points of view, and that is all we want of it’ (1859). 38 Scene www.intellectbooks.com 39 04_SCENE_5.1_Bogre_37-46.indd 39 21/08/17 11:41 AM Michelle Bogre In 1911, Thomas Jennings was convicted of murder based on a photograph introduced as evidence that he left his fingerprints on a freshly painted fence, even as eyewitness testimony was ruled inadmissible because it was contradic- tory (Green-Lewis 1996: 187). Most recently, the US Supreme Court in Brown v. Plata ordered the State of California to reduce its prison population to 137.5 per cent of capacity, based in part on photographic evidence submitted at trial (Brown v. Plata 2011). The photographic evidence was so compelling that three black and white images were attached to the Supreme Court’s decision. The San Francisco police department employs an Instagram officer who monitors Instagram feeds (Mcalone 2015). In one recent case, Officer Eduard Ochoa had been following an account, ‘40glock’, that displayed photographs of the Instagram account owner (identified in court papers only as ‘K.B.’ because he was a minor) out on probation, with a gun tucked in his waistband. Police used these images as the basis to search K.B.’s house because being on proba- tion prohibits gun ownership. An appellate court affirmed the firearms convic- tion, accepting the Instagram photos as evidence, noting that a photograph is authenticated ‘by showing it is a fair and accurate representation of the scene depicted’ (The People v. K.B. 2015). The Courts are nonplussed about the poten- tial for digital manipulation, observing correctly that image manipulation can be verified. Judges and jurors in the early twentieth century believed photographs, but scholars and critics challenged the photograph as truth because a photograph was mere description and it was malleable, both while it was being taken (a photographer makes many decisions such as lens focal length, point of view, angle, exposure, etc.) and then in post production.
Recommended publications
  • Digital Holography Using a Laser Pointer and Consumer Digital Camera Report Date: June 22Nd, 2004
    Digital Holography using a Laser Pointer and Consumer Digital Camera Report date: June 22nd, 2004 by David Garber, M.E. undergraduate, Johns Hopkins University, [email protected] Available online at http://pegasus.me.jhu.edu/~lefd/shc/LPholo/lphindex.htm Acknowledgements Faculty sponsor: Prof. Joseph Katz, [email protected] Project idea and direction: Dr. Edwin Malkiel, [email protected] Digital holography reconstruction: Jian Sheng, [email protected] Abstract The point of this project was to examine the feasibility of low-cost holography. Can viable holograms be recorded using an ordinary diode laser pointer and a consumer digital camera? How much does it cost? What are the major difficulties? I set up an in-line holographic system and recorded both still images and movies using a $600 Fujifilm Finepix S602Z digital camera and a $10 laser pointer by Lazerpro. Reconstruction of the stills shows clearly that successful holograms can be created with a low-cost optical setup. The movies did not reconstruct, due to compression and very low image resolution. Garber 2 Theoretical Background What is a hologram? The Merriam-Webster dictionary defines a hologram as, “a three-dimensional image reproduced from a pattern of interference produced by a split coherent beam of radiation (as a laser).” Holograms can produce a three-dimensional image, but it is more helpful for our purposes to think of a hologram as a photograph that can be refocused at any depth. So while a photograph taken of two people standing far apart would have one in focus and one blurry, a hologram taken of the same scene could be reconstructed to bring either person into focus.
    [Show full text]
  • Sample Manuscript Showing Specifications and Style
    Information capacity: a measure of potential image quality of a digital camera Frédéric Cao 1, Frédéric Guichard, Hervé Hornung DxO Labs, 3 rue Nationale, 92100 Boulogne Billancourt, FRANCE ABSTRACT The aim of the paper is to define an objective measurement for evaluating the performance of a digital camera. The challenge is to mix different flaws involving geometry (as distortion or lateral chromatic aberrations), light (as luminance and color shading), or statistical phenomena (as noise). We introduce the concept of information capacity that accounts for all the main defects than can be observed in digital images, and that can be due either to the optics or to the sensor. The information capacity describes the potential of the camera to produce good images. In particular, digital processing can correct some flaws (like distortion). Our definition of information takes possible correction into account and the fact that processing can neither retrieve lost information nor create some. This paper extends some of our previous work where the information capacity was only defined for RAW sensors. The concept is extended for cameras with optical defects as distortion, lateral and longitudinal chromatic aberration or lens shading. Keywords: digital photography, image quality evaluation, optical aberration, information capacity, camera performance database 1. INTRODUCTION The evaluation of a digital camera is a key factor for customers, whether they are vendors or final customers. It relies on many different factors as the presence or not of some functionalities, ergonomic, price, or image quality. Each separate criterion is itself quite complex to evaluate, and depends on many different factors. The case of image quality is a good illustration of this topic.
    [Show full text]
  • Seeing Like Your Camera ○ My List of Specific Videos I Recommend for Homework I.E
    Accessing Lynda.com ● Free to Mason community ● Set your browser to lynda.gmu.edu ○ Log-in using your Mason ID and Password ● Playlists Seeing Like Your Camera ○ My list of specific videos I recommend for homework i.e. pre- and post-session viewing.. PART 2 - FALL 2016 ○ Clicking on the name of the video segment will bring you immediately to Lynda.com (or the login window) Stan Schretter ○ I recommend that you eventually watch the entire video class, since we will only use small segments of each video class [email protected] 1 2 Ways To Take This Course What Creates a Photograph ● Each class will cover on one or two topics in detail ● Light ○ Lynda.com videos cover a lot more material ○ I will email the video playlist and the my charts before each class ● Camera ● My Scale of Value ○ Maximum Benefit: Review Videos Before Class & Attend Lectures ● Composition & Practice after Each Class ○ Less Benefit: Do not look at the Videos; Attend Lectures and ● Camera Setup Practice after Each Class ○ Some Benefit: Look at Videos; Don’t attend Lectures ● Post Processing 3 4 This Course - “The Shot” This Course - “The Shot” ● Camera Setup ○ Exposure ● Light ■ “Proper” Light on the Sensor ■ Depth of Field ■ Stop or Show the Action ● Camera ○ Focus ○ Getting the Color Right ● Composition ■ White Balance ● Composition ● Camera Setup ○ Key Photographic Element(s) ○ Moving The Eye Through The Frame ■ Negative Space ● Post Processing ○ Perspective ○ Story 5 6 Outline of This Class Class Topics PART 1 - Summer 2016 PART 2 - Fall 2016 ● Topic 1 ○ Review of Part 1 ● Increasing Your Vision ● Brief Review of Part 1 ○ Shutter Speed, Aperture, ISO ○ Shutter Speed ● Seeing The Light ○ Composition ○ Aperture ○ Color, dynamic range, ● Topic 2 ○ ISO and White Balance histograms, backlighting, etc.
    [Show full text]
  • Passport Photograph Instructions by the Police
    Passport photograph instructions 1 (7) Passport photograph instructions by the police These instructions describe the technical and quality requirements on passport photographs. The same instructions apply to all facial photographs used on the passports, identity cards and permits granted by the police. The instructions are based on EU legislation and international treaties. The photographer usually sends the passport photograph directly to the police electronically, and it is linked to the application with a photograph retrieval code assigned to the photograph. You can also use a paper photograph, if you submit your application at a police service point. Contents • Photograph format • Technical requirements on the photograph • Dimensions and positioning • Posture • Lighting • Expressions, glasses, head-wear and make-up • Background Photograph format • The photograph can be a black-and-white or a colour photograph. • The dimensions of photographs submitted electronically must be exactly 500 x 653 pixels. Deviations as small as one pixel are not accepted. • Electronically submitted photographs must be saved in the JPEG format (not JPEG2000). The file extension can be either .jpg or .jpeg. • The maximum size of an electronically submitted photograph is 250 kilobytes. 1. Correct 2. Correct 2 (7) Technical requirements on the photograph • The photograph must be no more than six months old. • The photograph must not be manipulated in any way that would change even the small- est details in the subject’s appearance or in a way that could raise suspicions about the photograph's authenticity. Use of digital make-up is not allowed. • The photograph must be sharp and in focus over the entire face.
    [Show full text]
  • Photographic Films
    PHOTOGRAPHIC FILMS A camera has been called a “magic box.” Why? Because the box captures an image that can be made permanent. Photographic films capture the image formed by light reflecting from the surface being photographed. This instruction sheet describes the nature of photographic films, especially those used in the graphic communications industries. THE STRUCTURE OF FILM Protective Coating Emulsion Base Anti-Halation Backing Photographic films are composed of several layers. These layers include the base, the emulsion, the anti-halation backing and the protective coating. THE BASE The base, the thickest of the layers, supports the other layers. Originally, the base was made of glass. However, today the base can be made from any number of materials ranging from paper to aluminum. Photographers primarily use films with either a plastic (polyester) or paper base. Plastic-based films are commonly called “films” while paper-based films are called “photographic papers.” Polyester is a particularly suitable base for film because it is dimensionally stable. Dimensionally stable materials do not appreciably change size when the temperature or moisture- level of the film change. Films are subjected to heated liquids during processing (developing) and to heat during use in graphic processes. Therefore, dimensional stability is very important for graphic communications photographers because their final images must always match the given size. Conversely, paper is not dimen- sionally stable and is only appropriate as a film base when the “photographic print” is the final product (as contrasted to an intermediate step in a multi-step process). THE EMULSION The emulsion is the true “heart” of film.
    [Show full text]
  • One Is Enough. a Photograph Taken by the “Single-Pixel Camera” Built by Richard Baraniuk and Kevin Kelly of Rice University
    One is Enough. A photograph taken by the “single-pixel camera” built by Richard Baraniuk and Kevin Kelly of Rice University. (a) A photograph of a soccer ball, taken by a conventional digital camera at 64 64 resolution. (b) The same soccer ball, photographed by a single-pixel camera. The image is de- rived× mathematically from 1600 separate, randomly selected measurements, using a method called compressed sensing. (Photos courtesy of R. G. Baraniuk, Compressive Sensing [Lecture Notes], Signal Processing Magazine, July 2007. c 2007 IEEE.) 114 What’s Happening in the Mathematical Sciences Compressed Sensing Makes Every Pixel Count rash and computer files have one thing in common: compactisbeautiful.Butifyou’veevershoppedforadigi- Ttal camera, you might have noticed that camera manufac- turers haven’t gotten the message. A few years ago, electronic stores were full of 1- or 2-megapixel cameras. Then along came cameras with 3-megapixel chips, 10 megapixels, and even 60 megapixels. Unfortunately, these multi-megapixel cameras create enor- mous computer files. So the first thing most people do, if they plan to send a photo by e-mail or post it on the Web, is to com- pact it to a more manageable size. Usually it is impossible to discern the difference between the compressed photo and the original with the naked eye (see Figure 1, next page). Thus, a strange dynamic has evolved, in which camera engineers cram more and more data onto a chip, while software engineers de- Emmanuel Candes. (Photo cour- sign cleverer and cleverer ways to get rid of it. tesy of Emmanuel Candes.) In 2004, mathematicians discovered a way to bring this “armsrace”to a halt.
    [Show full text]
  • 19Th Century Photograph Preservation: a Study of Daguerreotype And
    UNIVERSITY OF OKLAHOMA PRESERVATION OF INFORMATION MATERIALS LIS 5653 900 19th Century Photograph Preservation A Study of Daguerreotype and Collodion Processes Jill K. Flowers 3/28/2009 19th Century Photograph Preservation A Study of Daguerreotype and Collodion Processes Jill K. Flowers Photography is the process of using light to record images. The human race has recorded the images of experience from the time when painting pictographs on cave walls was the only available medium. Humanity seems driven to transcribe life experiences not only into language but also into images. The birth of photography occurred in the 19th Century. There were at least seven different processes developed during the century. This paper will focus on two of the most prevalent formats. The daguerreotype and the wet plate collodion process were both highly popular and today they have a significant presence in archives, libraries, and museums. Examination of the process of image creation is reviewed as well as the preservation and restoration processes in use today. The daguerreotype was the first successful and practical form of commercial photography. Jacques Mande‟ Daguerre invented the process in a collaborative effort with Nicephore Niepce. Daguerre introduced the imaging process on August 19, 1839 in Paris and it was in popular use from 1839 to approximately 1860. The daguerreotype marks the beginning of the era of photography. Daguerreotypes are unique in the family of photographic process, in that the image is produced on metal directly without an intervening negative. Image support is provided by a copper plate, coated with silver, and then cleaned and highly polished.
    [Show full text]
  • Evolution of Photography: Film to Digital
    University of North Georgia Nighthawks Open Institutional Repository Honors Theses Honors Program Fall 10-2-2018 Evolution of Photography: Film to Digital Charlotte McDonnold University of North Georgia, [email protected] Follow this and additional works at: https://digitalcommons.northgeorgia.edu/honors_theses Part of the Art and Design Commons, and the Fine Arts Commons Recommended Citation McDonnold, Charlotte, "Evolution of Photography: Film to Digital" (2018). Honors Theses. 63. https://digitalcommons.northgeorgia.edu/honors_theses/63 This Thesis is brought to you for free and open access by the Honors Program at Nighthawks Open Institutional Repository. It has been accepted for inclusion in Honors Theses by an authorized administrator of Nighthawks Open Institutional Repository. Evolution of Photography: Film to Digital A Thesis Submitted to the Faculty of the University of North Georgia In Partial Fulfillment Of the Requirements for the Degree Bachelor of Art in Studio Art, Photography and Graphic Design With Honors Charlotte McDonnold Fall 2018 EVOLUTION OF PHOTOGRAPHY 2 Acknowledgements I would like thank my thesis panel, Dr. Stephen Smith, Paul Dunlap, Christopher Dant, and Dr. Nancy Dalman. Without their support and guidance, this project would not have been possible. I would also like to thank my Honors Research Class from spring 2017. They provided great advice and were willing to listen to me talk about photography for an entire semester. A special thanks to my family and friends for reading over drafts, offering support, and advice throughout this project. EVOLUTION OF PHOTOGRAPHY 3 Abstract Due to the ever changing advancements in technology, photography is a constantly growing field. What was once an art form solely used by professionals is now accessible to every consumer in the world.
    [Show full text]
  • Intro to Digital Photography.Pdf
    ABSTRACT Learn and master the basic features of your camera to gain better control of your photos. Individualized chapters on each of the cameras basic functions as well as cheat sheets you can download and print for use while shooting. Neuberger, Lawrence INTRO TO DGMA 3303 Digital Photography DIGITAL PHOTOGRAPHY Mastering the Basics Table of Contents Camera Controls ............................................................................................................................. 7 Camera Controls ......................................................................................................................... 7 Image Sensor .............................................................................................................................. 8 Camera Lens .............................................................................................................................. 8 Camera Modes ............................................................................................................................ 9 Built-in Flash ............................................................................................................................. 11 Viewing System ........................................................................................................................ 11 Image File Formats ....................................................................................................................... 13 File Compression ......................................................................................................................
    [Show full text]
  • Introduction to Collection Surveys and Condition Reports
    Fundamentals of the Conservation of Photographs SESSION: Introduction to Collection-Level Surveys and Condition Reporting INSTRUCTOR: Monique Fischer, Tram Vo SESSION OUTLINE ABSTRACT This part of the course will provide systematic approaches to writing condition reports for photographs and performing collection-level surveys. This section of the course will provide students with the information needed to perform the small scale survey during the distance mentoring phase. LEARNING OBJECTIVES As a result of this session, participants should be able to: Understand photographic materials, processes, and deterioration characteristics in order to write a proper condition report. Know how to implement a systematic preservation program and understand issues such as environmental control, disaster preparedness, storage and handling, potential hazards, reformatting and conservation treatment. Understand that performing a survey is the best way for a collection to survive. CONTENT OUTLINE Introduction with PPT presentations: “Condition Reporting of Photographs” and “Surveying Photograph Collection” Examples of different condition report forms, including electronic formats, will be examined and discussed. Samples will be provided to participants. Provide students with a basic outline of a survey report and discuss. Pros and cons of the condition report and survey form hand -outs will be discussed. “Hands-on” exercise: provide each student with an unknown photograph and have them write a complete condition report using a form that has been made available. Students will present reports in class. During the distance mentoring phase students will conduct a survey of their family photographs. The introduction given during the summer school will provide the information students need for this activity. www.getty.edu/conservation SESSION OUTLINE CONT’D.
    [Show full text]
  • Removing Camera Shake from a Single Photograph
    Removing Camera Shake from a Single Photograph Rob Fergus1 Barun Singh1 Aaron Hertzmann2 Sam T. Roweis2 William T. Freeman1 1MIT CSAIL 2University of Toronto Figure 1: Left: An image spoiled by camera shake. Middle: result from Photoshop “unsharp mask”. Right: result from our algorithm. Abstract depth-of-field. A tripod, or other specialized hardware, can elim- inate camera shake, but these are bulky and most consumer pho- tographs are taken with a conventional, handheld camera. Users Camera shake during exposure leads to objectionable image blur may avoid the use of flash due to the unnatural tonescales that re- and ruins many photographs. Conventional blind deconvolution sult. In our experience, many of the otherwise favorite photographs methods typically assume frequency-domain constraints on images, of amateur photographers are spoiled by camera shake. A method or overly simplified parametric forms for the motion path during to remove that motion blur from a captured photograph would be camera shake. Real camera motions can follow convoluted paths, an important asset for digital photography. and a spatial domain prior can better maintain visually salient im- age characteristics. We introduce a method to remove the effects of Camera shake can be modeled as a blur kernel, describing the cam- camera shake from seriously blurred images. The method assumes era motion during exposure, convolved with the image intensities. a uniform camera blur over the image and negligible in-plane cam- Removing the unknown camera shake is thus a form of blind image era rotation. In order to estimate the blur from the camera shake, deconvolution, which is a problem with a long history in the im- the user must specify an image region without saturation effects.
    [Show full text]
  • An Introduction to the Digital Reproduction of Photographs | 3
    An Introduction to the C HAPTER Digital Reproduction of Photographs || OBJECTIVES After completing this chapter you will be able to: ■ explain the sources and attributes of digital photographs. ■ explain the methods used to reproduce digital photographs. ■ explain the conventions used by professional printers/ publishers to describe halftones. ■ use Photoshop’s tools to measure halftone dot shape, screen angle, and screen frequency. ■ explain the different types of resolution measurements. ■ use a step-by-step process to choose the correct dot shape, screen angle, and screen frequency for a given printing process and substrate using a given output device. ■ choose the best file format in which to save a given photograph. | 1 2 | C HAPTER ONE || Printing and publishing technicians are required to prepare photographs for reproduction so that the printed photographs appear pleasing to the viewer. This is not an easy task. When a photograph is printed, many variables, including the type of printing press, the type of paper, the ink, and even weather conditions combine to alter the appearance of the reproduction. Even if the photograph is to be reproduced by electronic means—on the Internet or CD-ROM, for instance—the viewer’s computer and monitor will affect the appearance of the image. If the technician knows in advance the variables that will affect a reproduction, corrections can be built into the photograph so that the reproduction will appear pleasing to the eye. If these corrections are not made, the reproduced photograph will probably look unsightly. In the past, such corrections required the skill of highly talented photographic retouchers who knew all the variables that could affect a printed reproduction.
    [Show full text]